Not cruel, just stating the obvious. Like if you’re that unstable, causing any amount of change to make you extremely unhappy with your relationship, you probably shouldn’t be in the relationship to begin with. You shouldn’t have kids in the first place even, like if you’re that quick to commit to something you know next to nothing about, that is an issue entirely caused by your selfishness and/or impulsiveness.
The only obligation you have is to your kids, because you made the decision to bring them into this world and you’re responsible for cursing them with existence, you have no obligation to your relationship or your parents or anyone else for that matter.